Stroke adjuster



2 Sheets-Sheet l K. KELLEY STROKE ADJUSTER Filed April 8, 1940 INVENTOR.

' ATTORNEY.

J e d K k T O K 1-J11.J 11111111111a tfii llllafi1-;11-:.1h

Jan. 6, 1942.

Fig.1

Patented Jan. 6, 1942 UNITED STATE QFlFI STROKE ADJUSTER Kork Kelley, Wichita Tex. Application April8, 1940, Serial Ne; 328,552

(mu-11o) 2 Claims.

assembly. U

A still further object of this invention i to providean adjustable standard when the deyice is used with a pump jack assembly, i Still another object of this invention is to pro-' Vide a stroke adjuster which adjuster may be used in'a horizontal, vertical or righteangular plane with equal efiiciency. t

is movably secured to a. cross-member, I .by means 'of a clevi hook l6 which is secured to therod l4. I H The sucker rods l1 are disposed axially within the usual tubing 13 and casingjl9, and are indirectly secured to an adjuster line 20. This line '20 carriesa clevis hook 2| in one end thereof and which hookfin turnis secured to an adjustable Aconstruction designed to carry out the inwith other features of the invention;

The invention will be more readily understood from areading of the following specification and by reference to the accompanying drawings, in which an example of the invention is shown, and, wherein: i

Figure 1 is a transverse vertical sectionalview of a stroke adjuster for rodlines constructed in accordance with the'present invention. i t

Figure 2 is aside elevation of a slightly modified form of the invention.

Figure 3 is a plan view partly in elevation and partly in section showing the horizontal-type stroke adjuster.

vention will be hereinafter described, together Figure 4 is a horizontal cross-sectional view taken on lines 4-4 of Figure 1.

Figure 5 is a side elevational view having parts thereof broken away showing a slightly modified form of stroke adjuster used in connection with one type of pump jack assembly, and

Figure 6 is a plan view thereof.

In the drawings, the numeral I0 designates a standard constructed of suitable material and having bearings II positioned in the upper end thereof. A stroke adjuster I2 is suitably mounted in the bearings II by means of suitable stub axles l3 provided at the upper end of the adjuster l2 while the lower end of said adjuster is free to swing in an are about said axles I3. The adjuster !2 is operated by means of a rod M which rod is connected at one end to a suitable source of power (not shown) While the other end cross-member 22. By observing Figure 1, it may be seen that the cross-member 22 is threadedly secured. to an elongated rod 23 which rod is journaledjinits lower end in a suitable'bearin .24 which'bearing is provided in a lower brace memberi25 of the adjuster l2. The upperend of the rod 2 3 isjournaledinbearings 26 which beare ingslare' providedin ahead member 2,! of which the stub axles 13 are an integral part thereof. Ac'rank arm, 28. is fixedly secured to the extreme upper endofw the rod 23 whereby said rod may be rotated in either a clock-wise or a counter clock wise direction. Qfljhe body of the adjusterl2 is comprised of a pair of channel bars 30 beingsecured together at their upperand lower ends by the member 25 and .21. By'observing Figure l; itmay be seen that'the cross-member i5 is secured by means of bolts 3! near the lower end of the channels 30 whereby this cross member will exert an equal pressure upon each channel bar upon the back or power strok'e thereoffi The cross memb'er 22 is held in the 'desired verticalposition only by means of thethreaded rod 23,, but this member contactsjithe opposite "legs of the channel bars and exerts'an equal pressure uponeach on the down stroke of the device.

' In operation, as the power unit (not shown) draws'the adjuster I2 in a backward arc (to the right in Figure 1) the sucker rods I! will be raised due to its connection to the adjuster l2 through the medium of the member 20, 2| and 22. The weight of the sucker rods will swing the adjuster in a forward arc (to the left in Figure 1) to allow for the down or intake stroke of the pump. In the event that it is desired to pump a hundred barrels a day from a well that is producing but a hundred barrels, the cross-member 22 may be raised and adjusted whereby that particular well would pump exactly a hundred barrels in a day. It is a well-known fact that by constantly removing the oil as it seeps into the well, the static head pressure is entirely eliminatedwhereby this pressure at no time forces the oil back into the oil-bearing sand to decrease the life of that well. By manipulation of the,

scribed as is the rod 23 and crank arm 28. The brace member 27' is provided at the lower end of the body and carries stub axles l3 thereon while a brace member 25' is provided at the upper end through which the rod 23 projects. The, operation of this device is identical to that hereinbefore described and differs only in the fact that the pivot point of this adjuster is at the bottomv instead of at the top.

In Figure 3 a slightly modified form ofv theinaligning member 46 is secured to the cross-member 22 of the adjuster 35. In operation of this vention is shown. In this type adjuster the parts are identical to those parts shown in Figure 2 but the axles 13' are shown me vertical position whereby the body extends outwardly therefrom in a horizontal plane. The operation of this type adjuster is obvious.

In Figures 5 and 6-sti1l another form of the invention is shown. In this form an angular stroke adjuster 35 is provided. In one leg of the body of this adjuster is disposed the cross-head 22 and its accompanying rod 23 and .crank arm 28.. In the other leg the cross-member I5 is positioned. with its accompanying clevis l6 and power line. I4. The adjuster assembly is pivotally mounted in suitable bearings 36..which bearingsare secured to angularbrace bars 31 of a pump jack assembly 38. The assembly comprises a base frame 39 having a pair of uprights 40pivota1ly secured to the forward end thereof while theangular brace member 3] is pivoted at the rearward end of said base. Theuprights 40 are bent inwardly toward each otherv near the upper ends thereofand carry bearing boxes 4|. on their extreme upper ends. A horizontally disposed axle 42 is journaled in the bearing boxes 4| and carries thereon a pair of grooved. pulley wheels 43. Particular attention is called to. the fact, that the wheels 43 .are free. to .move .longitudinally upon the axle 42 whereby said. wheels are self-aligning.

A. cable. 44 has one end secured to orielhorizontal arm of a T-shaped cross-member 45 which member is secured to the extreme upper end of the pump rods H. The cable is then threaded over one of the wheels 43 and arranged to. engage a semi-circular aligning member 46 .andis then arranged. over the other wheel 43. and. has its otherend secured to the opposite arm of the T-. shaped member 45 The semi-circular, selfdevice, the adjuster converts a horizontal power into a vertical pull. Attention is called to the fact that a predetermined ratio is arranged between the power unit (not shown), the stroke adjuster 35, and the direct-life pulley wheels 43 whereby the troke may be adjusted through the medium of the threaded rod 23 as has hereinbefore been explained. Attention isalso directed to the fact that the frame of this assembly is adjustable due to the pivot points of the uprights 40 and angular brace members 31 whereby minute adjustments of the wheels 43 may be made.

Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed within the scope and meaning of the appended claims is also considered to be within the spirit and intent of the invention.

What is claimed is:

1. A stroke adjuster arranged for incorporation in a reciprocable rod line, a supporting structure, a frame pivotally mounted for swinging movement at one end to said supporting structure, said frame comprising a pair of confronting channel members defining spaced apart tracks, a screw rod journaled at either end in bearings mounted in either end of said frame, a cross-head movable longitudinally in either of said tracks, one of: said cross-heads having an internally threaded opening to receive said screw rod, meansfor stationarily .securing said companion cross-head in its track, means on either cross-head for securing sections of said rod line thereto and means for rotating said screw rod whereby to vary the length of stroke of said rod line during reciprocation thereof.

2. In an apparatus for varying the length of stroke of a reciprocable rod line, a support, a frame pivoted at one end to said support for oscillating movement, said frame comprising a pair of relatively parallel tracks, a fixed cross-head in one of said tracks to which a section of rod lineis connected, a. slidable cross-head in the companion track having means for receiving a complementary section of. said rod line, a. screw rod having its ends mounted in hearings in either end of said frame and means for rotating said screw rod to change the positions of said slidable cross-head whereby to vary the length of the stroke of said rod line during reciprocation thereof.

KORK KELLEY. 

